Ultraviolet photolysis of H2S and its implications for SH radical production in the interstellar medium
Ultraviolet photolysis of H2S and its implications for SH radical production in the interstellar medium
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H2S 的紫外光解及其对星际介质中 SH 自由基产生的影响
DOI：
10.1038/s41467-020-15343-4
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发表时间：
2020-03
影响因子：
16.6
通讯作者：
Xueming Yang
中科院分区：
文献类型：
--
作者：
Jiami Zhou;Yarui Zhao;Christopher S.Hansen;Jiayue Yang;Yao Chang;Yong Yu;Gongkui Cheng;Zhichao Chen;Zhigang He;Shengrui Yu;Hongbin Ding;Weiqing Zhang;Guorong Wu;Dongxu Dai;Colin M. Western;Michael N.R. Ashfold;Kaijun Yuan;Xueming Yang
基态的硫化氢自由基SH（X）和硫化氢分子H2S都在星际介质中被探测到，但返回的SH（X）/H2S丰度比意味着前者相对于当前模型预测的耗尽（假设H2S在低于电离极限的能量下吸收光子导致H + SH光产物）。在这里，我们报告了在122 ≤λ≤155 nm范围内的许多波长下，通过喷射冷却的H2S分子的光解形成的H原子和S（1D）原子的平移光谱测量，为这种明显的耗尽提供了理论基础;形成SH（X）产物的量子产率，Γ，从1（在最长激发波长处）下降到短波长处的零。对Γ、H2S母体吸收和星际辐射场的波长依赖性进行卷积，表明只有约26%的光激发事件导致SH（X）产物。这些发现表明有必要修改相关的天体化学模型。
Hydrogen sulfide radicals in the ground state, SH(X), and hydrogen disulfide molecules, H2S, are both detected in the interstellar medium, but the returned SH(X)/H2S abundance ratios imply a depletion of the former relative to that predicted by current models (which assume that photon absorption by H2S at energies below the ionization limit results in H + SH photoproducts). Here we report that translational spectroscopy measurements of the H atoms and S(1D) atoms formed by photolysis of jet-cooled H2S molecules at many wavelengths in the range 122 ≤λ≤155 nm offer a rationale for this apparent depletion; the quantum yield for forming SH(X) products, Γ, decreases from unity (at the longest excitation wavelengths) to zero at short wavelengths. Convoluting the wavelength dependences of Γ, the H2S parent absorption and the interstellar radiation field implies that only ~26% of photoexcitation events result in SH(X) products. The findings suggest a need to revise the relevant astrochemical models.
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